This got great reviews (although I have never read it) and it is a good idea to learn a little about your tank before you set up. You will definitely want to consider the types of fish you would like, the conditions/food they need, the types of decor you would like etc. before purchasing anything.

This hood will give your new aquarium the light it needs and help keep warmth inside.

Next you will need to think about filtration of water. Aquarium undergravel filters filter your water through your gravel, so if you opt for this filter, you will also need an underwater vacuum.

This is the air tubing that you will need to connect your air pump to your undergravel filter.

Most fish will need a slightly warmer environment than room temperature (68ºF).

Essential for moving fish, changing water, adding fish, etc. Anything that could be stressful for fish, you need to use stress coat. It neutralizes tap water and calms fish.

A net is essential for moving/transferring fish or for the removal of dead/unwanted particulate from the tank.

It is recommended that you use 1 lb of gravel for every gallon of water in your tank. I use a natural looking yellow/brown stone to make my tanks environment look more realistic.

I also recommend live plants for any aquarium because they oxygenate the water, look more realistic, and provide food for your aquatic animals. However, being alive, some plants may die, your fish may eat them or other issues may arise, so to avoid all of that, fake plants work just as well as decoration.

Can't have fish without food for them. Tetramin boasts that it is nutritionally balanced and won't cloud water.

I use accu-clear when my tank starts to get cloudy (which can happen from poor cleaning maintenance or over feeding). It clumps together small particles to aid your filter in straining them out. However, this is no match to regular water changes and proper feeding.